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參數(shù)資料
| 型號： | MC68HC11C0FN3 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 3 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 48/76頁 |
| 文件大小： | 394K |
| 代理商： | MC68HC11C0FN3 |
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MOTOROLA
MC68HC11C0
52
MC68HC11C0TS/D
9 Pulse-Width Modulation Timer
The MC68HC11C0 MCU contains a PWM timer that is composed of two 8-bit modulators. Each of the
modulators can create independent continuous waveforms with software-selectable duty rates from 0%
to 100%.
The PWM system provides up to two pulse-width modulated waveforms on port H pins. Each channel
has its own counter. The two counters can be concatenated to create a single 16-bit PWM output based
on 16-bit counts. Two clock sources (A and S) and a flexible clock select scheme give the PWM system
a wide range of frequencies.
Four control registers configure the PWM outputs — PWCLK, PWPOL, PWSCAL, and PWEN. The PW-
CLK register selects the prescale value for the PWM clock sources and enables the 16-bit PWM func-
tion. The PWPOL register determines the polarity for each channel polarity and selects the clock source
for each channel. The PWSCAL register derives a user-scaled clock based on the A-clock source. The
PWEN register enables the PWM channels.
Each channel has a separate 8-bit counter, period register, and duty cycle register. The period and duty
cycle registers are double buffered so that if they are changed while the channel is enabled, the change
does not take effect until the counter rolls over or the channel is disabled. A new period or duty cycle
can be forced into effect immediately by writing to the period or duty cycle register and then writing to
the counter.
With a PWM channel configured for 8-bit mode and E equal to 2 MHz, frequencies can be produced
from one-half the E clock rate to more than 8 seconds per cycle. By configuring the PWM output for 16-
bit mode with E equal to 2 MHz, periods can be produced from one-half the E clock frequency to more
than 35 minutes per cycle.
In 16-bit mode, a PWM frequency of 60 Hz corresponds to a duty cycle resolution of only 30 parts per
million (0.0003%). In the same system, a PWM frequency of 1 kHz corresponds to a duty cycle resolu-
tion of 0.050%.
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相關代理商/技術參數(shù) |
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| MC68HC11C0VFN2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontroller |
| MC68HC11C0VFU2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontroller |
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